EAntenna 40MDY1S Rotary Dipole 1 EL. 40M 10,43m LONG - R2010717
SKU Part Number: 17804.40-1S
Shortened 40m Rotary Dipole EAntenna 40MDY1S A heavy-duty 40 metre rotary dipole providing full 7MHz-band operation from a...
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Shortened 40m Rotary Dipole

EAntenna 40MDY1S

A heavy-duty 40 metre rotary dipole providing full 7MHz-band operation from a compact 10.43m structure, with high-Q loading, 3kW power handling and a 1:1 balun included.

The EAntenna 40MDY1S is a shortened, rotatable 40m dipole designed for installations where a conventional full-size 40 metre dipole would be impractical.

Its loaded construction reduces the overall length to 10.43 metres while retaining useful bandwidth and performance across the 40 metre amateur band.

EAntenna specifies the antenna for 7.0 to 7.3MHz, comfortably encompassing the UK amateur 40m allocation of 7.0 to 7.2MHz.

FREQUENCY
7.0-7.3MHz

Designed specifically for the 40 metre amateur band.

TOTAL LENGTH
10.43m

A substantially more manageable installation than a conventional full-size 40m dipole.

POWER
3kW

Supplied with a matching 3kW 1:1 balun for direct 50Ω coaxial feed.

WIND SURVIVAL
160km/h

Heavy-duty mechanical construction for permanent mast installations.

Shortened 40m Design

40 Metres Without a Full-Size Dipole

A conventional half-wave dipole for 40 metres requires considerably more physical space. The 40MDY1S uses a shortened, loaded design to bring the complete antenna down to just 10.43m end to end.

This makes it particularly useful on towers and masts where a full-size 40m element would create excessive turning radius, mechanical loading or clearance problems.

Loading System

High-Q Loading Coils

EAntenna uses high-Q loading coils to electrically lengthen the shortened elements while minimising the additional loss normally associated with loading a physically shortened antenna.

The 40MDY1S is derived from the longer 40MDY1 design. EAntenna states that the shortened version sacrifices only around 0.05dBi compared with the longer model while retaining approximately 130kHz of useful bandwidth.

Compact Alternative
Almost the Performance of the Longer 40MDY1

The shortened 40MDY1S is intended for installations where the larger 40MDY1 is simply too long. The reduced 10.43m span and 5.22m turning radius make the antenna much easier to accommodate while retaining very similar on-air performance.

50Ω DIRECT FEED

1:1 Balun Included

The antenna is designed for a conventional 50Ω coaxial feeder and includes a 1:1 balun rated for up to 3kW, eliminating the need to purchase a separate matching transformer.

ROTATABLE INSTALLATION

5.22m Turning Radius

Mounted horizontally above a suitable rotator, the 40MDY1S can be turned to favour the broadside radiation pattern of the dipole towards the required direction.

Mechanical Construction

Built for Permanent Outdoor Installation

EAntenna uses aluminium antenna sections together with AISI 304 stainless-steel hardware throughout the structure.

The manufacturer specifies aluminium alloys including 6061/6063 T5 and 6082 T6, selected for mechanical strength and resistance to outdoor exposure.

The antenna sections are assembled using DIN 912 screws and high-pressure end clamps, creating a rigid installation intended for long-term mast mounting.

Mast Mounting

Heavy-Duty Centre Support

The central mast attachment uses a substantial aluminium support section measuring approximately 100 × 40 × 500mm with 4mm wall thickness.

Heavy-duty M8 U-bolts and stainless-steel clamps secure the antenna to the mast, with the overall structure specified to survive wind speeds of up to 160km/h / 100mph.

Installation Planning

Key Dimensions

10.43m Total antenna length
5.22m Turning radius
9kg Antenna weight
141 × 17 × 17cm Packed dimensions
Included

Ready for a 50Ω Feedline

1 × EAntenna 40MDY1S rotary dipole antenna
1 × 3kW 1:1 balun
Mast mounting and antenna assembly hardware
Technical Documentation

40MDY1S Technical Document

View the supplied technical documentation for the EAntenna 40MDY1S before installation.

View 40MDY1S Technical Document
Product Information

EAntenna 40MDY1S Technical Specifications

Manufacturer EAntenna
Model 40MDY1S
ML&S Part Number 17804.40-1S
Antenna Type Loaded rotary dipole
Elements 1
Band 40m
Manufacturer Frequency Range 7.0-7.3MHz
UK Amateur Band Coverage 7.0-7.2MHz
Gain 2.0dBi
Usable Bandwidth Approx. 130kHz
SWR 1.0:1 to 2.0:1
Nominal Impedance 50Ω
Maximum Power 3kW
Balun 1:1, 3kW, supplied
Feedline Single 50Ω coaxial feedline
Total Length 10.43m
Turning Radius 5.22m
Weight 9kg
Wind Survival 160km/h / 100mph
Loading High-Q loading coils with shortened tip sections
Hardware AISI 304 stainless steel
Aluminium 6061/6063 T5 and 6082 T6 alloys
Centre Mast Support Approx. 100 × 40 × 500mm aluminium section, 4mm thickness
Mast Hardware Heavy-duty M8 U-bolts and clamps
Packed Dimensions Approx. 141 × 17 × 17cm
Installation Summary

40MDY1S

The 40MDY1S is intended for horizontal rotary installation on a suitably rated mast, tower and rotator system.

Allow for the antenna's 10.43m overall span, 5.22m turning radius, 9kg antenna weight and expected local wind loading when selecting the supporting structure and rotator.

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Modified Equipment & Reversal Charges

Additional return conditions may apply to equipment modified at the customer's request, including wideband transmit or receive modifications.

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New Equipment Warranty

Minimum 2-Year Warranty

All new products supplied by ML&S carry a minimum two-year warranty against manufacturing defects, excluding batteries, which are covered by separate warranty terms.

Some manufacturers provide extended warranties, such as the three-year warranty available on eligible Yaesu equipment. Any additional coverage is subject to the manufacturer's terms and conditions.

Our workshop may assess and repair faulty equipment on site or refer it to the manufacturer or an authorised service centre where necessary.

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